WATLOW IND. WATROD Circulation Heater Installation & Maintenance Manual
I&M NUMBER: | Page: 4 |
Date: 6/11/2008 | Rev: 2.00 |
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atmosphere when the heater is continuously energized. Care should also be taken to keep combustible materials far enough away to be free of the effects of high temperatures.
5.Wiring
WARNING; HAZARD OF ELECTRIC SHOCK. Any installation involving electric heaters must be grounded to earth to eliminate shock hazard.
Electrical wiring to the heaters must be installed in accordance with the National Electric Code and any state and local electrical code by qualified personnel.
Consult wiring diagram supplied with the unit for correct feeder or leadwire connections. If wiring diagram is not supplied, the factory should be consulted for the appropriate wiring diagram. Feeder wire should be properly selected based on amperage, electrical power rating, ambient temperature, and type of environment. Feeder wire should also be housed in either rigid or flexible conduit which carries the same classification as the heater enclosure. It is the users responsibility to properly size and install feeder wire.
Feeder wire line connections may be made directly to stud terminals or box type compression fittings. Box type compression fittings will accept a #4 AWG maximum wire while stud terminals will accept a #10 ring connector(T&B, Amp, etc.). It is essential that these connections be tight. Stud terminals should be tightened to a maximum torque of 20
Line voltage must be equal to or less than rating stamped on the heater assembly. Some units are supplied as dual voltage . Example: 240V / 480V, check wiring diagram supplied with the unit to make sure which scheme was used. In most cases (unless specified by customer) units are wired for the higher voltage.
Thermostats can be supplied with circulation heaters. Consult the wiring diagram supplied with the heater for the suggested wiring of thermostats. For safe operation of thermostats, consult Installation and Maintenance manual for thermostats that is attached.
Thermostats should not be used as an "OFF" device; the use of a disconnect switch or circuit breaker is recommended. The disconnect switch will allow isolation of the heater when maintenance of the heater is required.
Start Up
Before energizing the heater the following items should have been checked with the heater power disconnected:
1.Electrical termination is tight and wiring is per wiring diagram supplied with heater
2.Proper disconnecting means and fusing have been installed
3.The voltage rating of the heater is the same as that being applied
4.Megohm is within acceptable limits
5.Proper temperature controls and safety limiting devices are in place
6.Heater is securely installed in tank header and no leaks are visible
Before energizing heater, correct fluid flow should be maintained over the heater bundle to ensure that heater elements do not overheat and fail.
After applying power to the heater make sure that the system is being controlled properly before leaving it to run unattended. Failure to do this could result in overheating resulting in personnel danger and fire.
Thermal cycling may cause the gasket or sealed joints to relax causing a leak. On flange units, tighten bolts to
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